There are several articles in IELTS reading.

Academic subjects, 3 articles, about 3000 words, not in order of difficulty. If you are in the examination room, you'd better do your familiar articles or relatively easy topics first, without having to do them in order. The time allocation is generally 20 minutes. Immigration is divided into three parts, the first two parts are short articles, each part is about 2 articles, and the third part is a long article of about 1000 words, which is almost as difficult as studying abroad (but no argumentative papers). So it's best to do it in order in the examination room. My suggestion is to finish the first two parts in 30 minutes, and then concentrate on writing the third long article in 30 minutes.